I'm running 6800 shift levers with my 10 speed wheels without a problem. The throw distance is the same so it just works. Eventually I'll move all my wheels to 11sp but for now it beats having waste good hubs by replacing with 11.

It's the rear mech that determines whether the system 'thinks' it's 10 or 11spd. If you run a 6870 rear mech the system will think it is 11spd - then the only way to run it 10spd is to wind in a limit screw to stop it reaching the 11th sprocket.

In that scenario the shifting will not be perfect since the 6870 RD will be shifting to 11sp cog spacing. If you want 10sp cassettes, you will need a 6770 RD and can use 6870 everywhere else.

The RD determines the the cog setup. 6770 = 10sp 6870 = 11sp. All other components are compatible, though not optimal. The 6870 FD will trim based upon 11sp chain and chainring architecture, so you may have some misalignment, though you won't know how much until you try it.

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